This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
The Oak Marshall Ward Fig . en Fig Diagram of the course of the vascular bundles as they come down from the leaves into the stem The horizontal dotted lines represent the levels of sucessive leaves the triangular white area beneath the upper letter is the insertion of leaf Each group of bundles form leaf as mm ms ms etc see text